H.P. Blavatsky 
Studies in Occultism [EPUB ebook] 

Occultism is not magic, though magic is one of its tools. Occultism is not the acquirement of powers, whether psychic or intellectual, though both are its servants. Neither is occultism the pursuit of happiness, as men understand the word; for the first step is sacrifice, the second, renunciation. Occultism is the science of life, the art of living…